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Sulfonamide drugsIn 1932 German bacteriologist Gerhard Domagk announced that the red dye Prontosil is active against streptococcal infections in mice and humans. Soon afterward French workers showed that its active antibacterial agent is sulfanilamide. In 1936 English physician Leonard Colebrook and colleagues provided overwhelming evidence of the efficacy of both Prontosil and sulfanilamide in streptococcal septicemia (bloodstream infection), thereby ushering in the sulfonamide era. New sulfonamides, which appeared with astonishing rapidity, had greater potency, wider antibacterial range, or lower toxicity. Some stood the test of time. Others, such as the original sulfanilamide and its immediate successor, sulfapyridine, were replaced by safer and more powerful agents.

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A dramatic episode in medical history occurred in 1928, when Alexander Fleming noticed the inhibitory action of a stray mold on a plate culture of staphylococcus bacteria in his laboratory at St. Mary’s Hospital, London. Many other bacteriologists must have made the observation, but none had realized the possible implications. The mold was a strain of Penicillium—P. notatum—which gave its name to the now-famous drug penicillin. In spite of his conviction that penicillin was a potent antibacterial agent, Fleming was unable to carry his work to fruition, mainly because the techniques to enable its isolation in sufficient quantities or in a sufficiently pure form to allow its use on patients had not been developed.